- odds ratio - the ratio of the likelihood of an event occurring in one group to that of it occurring in another group. An odds ratio of 1 indicates that the condition or event under study is equally likely to occur in both groups. An odds ratio greater than 1 indicates that the condition or event is more likely to occur in the rst group and an odds ratio less than 1 indicates that the condition or event is less likely to occur in the first group.
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